unfortunatly the only fix is to replace the firmware chip itself which requires a new main PCA/formatter, I would suggest with the age of this unit that would be most difficult to get hold of and would probably cost more to repair than it would be to procure a 2nd hand more recent unit

1. Thanks for coming up for air2. We figured out the problem3. It's a master panel board in the bottom right corner of the printer4. At this time we will be throwing out this HP 330 and getting another

This indicates that either the black print cartridge is faulty, misplaced or missing. Try inserting a different black cartridge. Also firmly press the large green plunger fully down once, and then release it. The plunger should return to its original position. Then reset the printer and try printing again. If the problem persists try using a new black cartridge and primeit before use with the power on.